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hrv: a 5-min window needs 20 clean differences to join the nightly RMSSD #89

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abdulsaheel merged 4 commits into from
Oct 9, 2026
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hrv: a 5-min window needs 20 clean differences to join the nightly RMSSD #89

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13b11fb
fix(hrv): refuse RMSSD when the RR stream banks more beat-time than e…
Oct 5, 2026
f130a28
fix(hrv): judge each window's beat-time against the time it actually has
Oct 8, 2026
68a20b2
fix(hrv): a 5-min window needs 20 clean differences to join the night…
Oct 5, 2026
e14b785
fix(hrv): count duplicate beats wherever they sit; say thin windows i…
Oct 8, 2026
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3 changes: 2 additions & 1 deletion ALGORITHMS.md
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Expand Up @@ -56,7 +56,8 @@ Grouped by family (subdirectory under `lib/src/onehz/`). File paths are relative
|---|---|---|---|
| `hrvTime` | `clinical/hrv_time.dart` | RMSSD/SDNN/pNNx | standard time-domain HRV |
| `nocturnalRmssd` | `clinical/hrv_time.dart` | median-of-5-min-window nightly RMSSD | — |
| `sleepSessionWindowedRmssd` | `clinical/hrv_time.dart` | mean-of-5-min-window RMSSD with Malik ectopic rejection | Malik et al. |
| `sleepSessionWindowedRmssd` / `sleepSessionRmssdDetail` | `clinical/hrv_time.dart` | mean-of-5-min-window RMSSD; windows need ≥ 20 clean successive differences (ultra-short RMSSD literature); Malik 20 % ectopic rejection | Malik et al.; Munoz et al. 2015; Baek et al. 2015 |
| `rrCoverage` | `clinical/hrv_time.dart` | Σ plausible RR ÷ wall-clock span; > 1.10 means duplicated or interleaved beats, and `hrvTime` / `nocturnalRmssd` / `nightHrvShape` / the sleep-session headline refuse RMSSD; the headline also drops any 5-min window holding more beat-time than its length | — (integrity check; contiguous runs measure 0.963–1.001) |
| `hrvFreq` | `clinical/hrv_freq.dart` | LF/HF via Lomb-Scargle periodogram on native (unevenly-sampled) beat times | Laguna, Moody & Mark 1998; Bigger 1992 |
| `decelerationCapacity` / `accelerationCapacity` | `clinical/prsa.dart` | Phase-rectified signal averaging (DC/AC) | Bauer et al. 2006 |
| `nocturnalRhr` / `hrDip` | `clinical/nocturnal.dart` | nocturnal resting HR + dip classification | — |
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